The short answer
Most pricing sheets calculate margin as price minus cost, fees and shipping. They treat every sale as final. When a share of orders comes back, the refund, the return label and the lost resale value come out of the same margin. A product that looks healthy on paper can lose money once returns are included.
Contribution margin after returns
Take revenue, subtract product cost, outbound shipping and fees, then subtract the average return cost per order (see how to calculate it). The result is closer to the margin you actually keep.
How averages hide the problem
A catalog average can look fine while a few SKUs lose money on every return. Because Walmart refunds are issued once the carrier first scans the return, cash leaves before the item is inspected, which makes the leak easy to miss on a monthly report.
Three quick checks
- Which five SKUs have the highest total return cost?
- What is your return cost per order this month compared with last month?
- How much of that cost is caused by something you control, such as listing accuracy or packaging?
What not to do
Do not try to protect margin by charging customers return shipping or restocking fees outside what Walmart allows, or by discouraging returns. Walmart's published policy prohibits that. Fix the cause instead; see reducing avoidable returns.
This topic is covered step by step in the complete book, which includes the Returns Command Center. For the book overview, see the research page.
Sources and verification
Walmart changes its seller policies from time to time. This page reflects the Marketplace Learn guide as last updated on August 31, 2026 and checked on October 4, 2026. Always rely on the current wording in your own Seller Center account and on the official pages below.
Educational guide only. Not legal, tax or financial advice. Independent of, and not affiliated with or endorsed by, Walmart. No result is guaranteed.